SBS 2011 - High Disk Queue Length - 2.7 TB NTFS logical drive?

I've inherited a SBS2011. The server is extremely slow and I've pinned it down to disk issues.
I've attached screenshots of PerfMon, HP Array Config, and diskmgmt.

CPU & Memory usage never seems to be excessive, avg memory is about 35% and avg cpu is about 7%

Any advice on where to even start to resolving these disk issues? They do use SQL on this server which obviously has the highest total reads. Otherwise its hit or miss as to what is using Disk Activity.diskmgmt.JPGhparray.JPGperfmon.jpg

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